CN102534066B - High-temperature molten steel slag treating method - Google Patents
High-temperature molten steel slag treating method Download PDFInfo
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- CN102534066B CN102534066B CN2011104128797A CN201110412879A CN102534066B CN 102534066 B CN102534066 B CN 102534066B CN 2011104128797 A CN2011104128797 A CN 2011104128797A CN 201110412879 A CN201110412879 A CN 201110412879A CN 102534066 B CN102534066 B CN 102534066B
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- slag
- cao
- sio
- steel slag
- modifying agent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a high-temperature molten steel slag treating method. A modifying agent with main components containing calcium oxide, silicon oxide and aluminum oxide is added, therefore the molar ratio of calcium oxide, silicon oxide and aluminum oxide in modified steel slag meets one or two kinds of CaO:SiO2=2.5-3:1 or CaO:SiO2:Al2O3=25-30:15-22:1, and the steel slag forms a stable spinel structure. In the method, the raw materials of the modifying agent of the steel slag have wide sources, the cost is low, the manufacture process is simple, and the method is suitable for converters, main frequency furnaces and arc furnaces to produce various kinds of steel slag. The steel slag is modified, the stability of the steel slag is good, and free calcium oxide and aluminum oxide in the steel slag can be preferentially reduced. The steel slag forms the stable spinel structure, so that the application scope of the steel slag is expanded.
Description
Technical field
The present invention relates to discarded slag recycling technical field, a kind of high-temperature molten steel slag treating method specifically.
Background technology
Slag is the byproduct in steelmaking process, and the quantity discharged of slag accounts for the 15%-20% of product made from steel amount.2011, whole nation slag accumulative total reaches 3.5 hundred million tons, large steel slag is thrown aside accumulation, be that contaminate environment takies again a large amount of soils, cause simultaneously the wasting of resources, cause huge destruction to ecotope, affect the Sustainable development of Iron And Steel Industry, so slag is carried out resource utilization and high value comprehensive utilizating research, realize the high efficiente callback utilization of slag, be one of important topic of facing of China's Iron And Steel Industry.
The composition of slag is very complicated, contains the gelling mineral, but its content is less, causes the slag activity low, and owing to containing free calcium oxide and magnesium oxide in slag, the poor stability of slag.Improving the slag activity and reducing Unstable Substance content is the gordian technique difficult problem that the slag Recovery and recycle utilizes.
200720011864.9 1 kinds of structural slag improver granule of composite layers of patent, be followed successively by from inside to outside the four-layer structure of slag forming agent layer, thinner layer, metal bisque, fusing assistant layer composition from the center, particle size: 5mm～25mm, every layer thickness size ratio is: slag forming agent layer: thinner layer: metal bisque: fusing assistant layer=1: 0.2～0.3: 0.3～0.4: 0.1～0.2.The slag forming agent layer is that active lime or metallurgical lime, thinner layer are that bauxitic clay or rhombspar, metal bisque are aluminium, magnesium or aluminum magnesium alloy, and the fusing assistant layer is fluorite or boric anhydride; A kind of ladle deoxidation slag making modification agent is disclosed 200710157920.4 disclose the present invention, comprise active lime, metal powder, bauxitic clay and limestone powder and fusing assistant, it is characterized in that modification agent is to be made the spherical particle of bilayer or three-decker by above-mentioned materials, above-mentioned two kinds of slag modifying agent purposes are to improve steel quality, can't solve the slag instability problem; Patent 02122578.8 discloses a kind of steel slag modification agent, and add-on is the 3-15% of slag total amount, and wherein modification agent comprises: unslaked lime 5-75%, coal: 0-50%, quartz sand: 0-70%; Bauxitic clay and kaolin 0-70% fluorite 3-10%, one or more of soda ash and saltcake 2-10%, its purpose are that slag iron separates, and also can't guarantee slag stability.Patent 200710114708.X provides a kind of method of steel slag property optimized processing, and concrete steps are as follows: get a certain amount of slag, add that to account for the slag weight percent be 2-10% calcareous material (in CaO), the siliceous material of 1-5% is (with SiO
2Meter), the aluminabased material of 1-4% is (with Al
2O
3Meter), mixed grinding is fine powder, and calcining forms; The method need to be carried out break process to slag, also needs calcining, complex process, and cost is high.Patent 200810048602.9 discloses a kind of steel slag stability modification agent, and addition is 0.5～50% of slag total amount, and described steel slag stability modification agent is that composition and weight ratio are: SiO
2: 30～99.98, Al
2O
3: 0.001～40, CaO:0.001～40, MgO:0.001～20; The introducing thing of these compositions can be one or more the mixture in blast furnace slag, quartz sand, river sand.This steel slag modification agent can't be adjusted the slag mobility, can't use the liquid steel slag atomizing to process.
Summary of the invention
The problem that exists when processing slag for solving prior art the invention provides a kind of high-temperature molten steel slag treating method.
The present invention solves the problems of the technologies described above the technical scheme of employing to be: a kind of high-temperature molten steel slag treating method, get CaO, SiO in the slag after processing
2And Al
2O
3Mol ratio be final proportioning, final proportioning satisfies CaO:SiO at least
2=2-4:1 or CaO: SiO
2: Al
2O
3A kind of in=15-30:10-25:1;
Concrete operation step is as follows:
1) get the slag sample, detect and determine its CaO, SiO
2And Al
2O
3Content, and compare with final proportioning, get approaching final proportioning as the target proportioning;
2) according to CaO, SiO in the slag sample
2And Al
2O
3Content and the content difference between the target proportioning, calculate the required CaO that adds, SiO
2And Al
2O
3Content;
3) calculate gained according to step 2 and take CaO, SiO
2And Al
2O
3, and it is crushed to respectively below 5 orders, make modifying agent after mixing, standby;
4) modifying agent of the 1-5% of weighing liquid steel slag gross weight is put into bottom cinder ladle, the liquid steel slag of 1300-1600 ℃ is flowed into cinder ladle improve, and the slag after then improveing atomizes to process and can form stable granular slag.
In the present invention, CaO, SiO in the slag after processing
2And Al
2O
3Mol ratio preferably satisfy at least CaO:SiO
2=2.5-3:1 or CaO: SiO
2: Al
2O
3A kind of in=25-30:15-22:1.
In the present invention, in improvement during liquid steel slag, also the modifying agent of the 1-5% of ponderable quantity liquid steel slag gross weight directly adds in the liquid steel slag that fills 1300-1600 ℃ and improves, and the processing that atomizes of the slag after then improve can form stable granular slag.
The present invention mainly is applicable to CaO in slag, SiO
2And Al
2O
3Mol ratio do not satisfy excellent CaO:SiO
2=2.5-3:1 or CaO: SiO
2: Al
2O
3The situation of one or both in=25-30:15-22:1; If the CaO in slag, SiO
2And Al
2O
3Mol ratio satisfy above-mentioned condition, need not add modifying agent to do improved treatment.
In the present invention, CaO can realize by one or more of adding in calcareous material such as calcite, marble, muddy limestone, chalk;
SiO
2Can realize by one or more of adding in siliceous material such as clay, quartz sand, sandstone, flyash, red mud, be preferably clay;
Al
2O
3Can realize by one or more of adding in bauxitic clay, coal gangue or glass cullet, be preferably bauxitic clay.
Beneficial effect: the present invention makes calcium oxide, silicon oxide and aluminum oxide in slag form stable spinel structure by adding the slag modifying agent, the starting material wide material sources of slag modifying agent, with low cost, preparation technology is simple, and is applicable to the various slags of generation such as converter main frequency furnace and electric arc furnace; After it was improved slag, the slag good stability can preferentially reduce calcium oxide and magnesium oxide free in slag, and make slag form stable spinel structure, has improved the slag range of application.
Embodiment
The present invention is further elaborated (if no special instructions, the percentage composition described in embodiments of the invention all is weight percentage) below in conjunction with specific embodiment:
Embodiment 1
Original slag is chosen the slag of Jinan steel enterprise, and its chemical composition is CaO 38.96%, SiO
213.27%, Fe
2O
322.62%, FeO 9.17%, Al
2O
3The calcium oxide 2.6% that 1.59%, MgO 6.68% is free, free magnesium oxide is 6.68%, other are 6.52% years old.
According to the slag composition as can be known: CaO:SiO
2=
=3.15:1;
CaO?：SiO
2：Al
2O
3=
；
In the 1000kg slag, CaO: 1000000 * 0.3896/56=6957(mol);
SiO
2:1000000×0.1327/60=2211.7（mol）；
In view of slag content and CaO:SiO
2=2.5-3:1 is the most approaching, so the modifying agent configuration should be on this basis, and getting the target proportioning is 3:1, and the add-on of modifying agent is 1% of slag quality, is 10kg,
Calculate and need the CaO and the SiO that add in the 1000kg slag
2Quality be respectively 2624g and 7376g.
Take 2624g CaO and 7376g SiO
2, be crushed to respectively below 5 orders, mix then that to be configured to modifying agent stand-by.Getting temperature with 2 tons of cinder ladles is liquid steel slag 1000kg between 1300-1500 ℃, and the modifying agent for preparing is added wherein, then adopts granulating steel slag equipment that liquid steel slag is made the granulation steel slag ball.
After testing, calcium oxide and the content of magnesia less than 0.1% of dissociating in slag after improvement, other content are 8%, and slag becomes spinel structure, stable performance.
Embodiment 2
Original slag chemical composition is CaO 40.32%, SiO
228.32%, FeO8.2%, Al
2O
32.21%, MgO 5.0%, free calcium oxide 12.3%, and free magnesium 3.5%, other are 1.5% years old.
According to the slag composition as can be known: CaO:SiO
2=
=1.53:1;
CaO?：SiO
2：Al
2O
3=
；
In the 1000kg slag, CaO: 1000000 * 0.4032/56=7200(mol);
SiO
2:1000000×0.2832/60=4720（mol）；
Al
2O
3：1000000×0.024/102=235.3（mol）；
In view of slag content and CaO: SiO
2: Al
2O
3=25-30:15-25:1 is the most approaching, so the target proportioning is set as CaO: SiO
2: Al
2O
3=30:21:1, the amount that adds modifying agent is 5% of slag quality, is 50kg;
Calculate and need the CaO, the SiO that add in the 1000kg slag
2And Al
2O
3Quality be respectively 16750g, 31762g and 1488g;
Take 16750g CaO, 31762g SiO
2With 1488g Al
2O
3, be crushed to respectively below 5 orders, mix then that to make modifying agent stand-by.Getting temperature with 2 tons of cinder ladles is liquid steel slag 1000kg between 1300-1500 ℃, and the modifying agent for preparing is added wherein, then adopts granulating steel slag equipment that liquid steel slag is made the granulation steel slag ball.
After testing, calcium oxide and the content of magnesia less than 1% of dissociating in steel slag ball after improvement, and slag is spinel structure, stable performance.
Embodiment 3
Original slag chemical composition is CaO 39.5%, SiO
216.8%, FeO17.2%, Al
2O
32.4%, MgO 6.8%, free calcium oxide 10.3%, and free magnesium 6.5%, other, 0.5%.
According to the slag composition as can be known: CaO:SiO
2=
=2.52:1;
CaO?：SiO
2：Al
2O
3=
；
In the 1000kg slag, CaO: 1000000*0.395/56=7053.6(mol);
SiO
2:1000000×0.168/60=2800（mol）；
Al
2O
3：1000000×0.024/102=235.3（mol）；
For original slag CaO: SiO
2: Al
2O
3=30:11.9:1 and CaO: SiO
2=2.52:1, therefore choosing the target proportioning is CaO: SiO
2=2.4:1, the addition of modifying agent are 2.5% of slag quality, are 25kg.
Calculate and need the CaO, the SiO that add in the 1000kg slag
2And Al
2O
3Quality be respectively 11518g and 13482g;
Take 11518g CaO and 13482g SiO
2, be crushed to respectively below 5 orders, mix then that to make modifying agent stand-by; Getting temperature with 2 tons of cinder ladles is liquid steel slag 1000kg between 1300-1500 ℃, and the modifying agent for preparing is added wherein, then adopts granulating steel slag equipment that liquid steel slag is made the granulation steel slag ball.
After testing, calcium oxide and the content of magnesia less than 1% of dissociating in steel slag ball after improvement, and slag is spinel structure, stable performance.
Claims (1)
1. high-temperature molten steel slag treating method, processing the original slag chemical composition of object is CaO 39.5%, SiO
216.8%, FeO17.2%, Al
2O
32.4%, MgO 6.8%, free calcium oxide 10.3%, and free magnesium 6.5%, other liquid steel slags of 0.5%, this treatment process is characterised in that:
(1) get CaO, SiO in slag after processing
2And Al
2O
3Mol ratio be final proportioning, final proportioning satisfies CaO:SiO at least
2=2-2.4:1 or CaO: SiO
2: Al
2O
3A kind of in=25-30:15-22:1;
(2) calculate according to original slag composition:
Compare with the final proportioning in step (1), getting the target proportioning is CaO: SiO
2=2.4:1
(3) get 1000 kilograms of original slags, calculate CaO, SiO
2And Al
2O
3Weight, wherein:
CaO：1000000×0.395/56=7053.6?mol
SiO
2:?1000000×0.168/60=2800?mol
Al
2O
3：1000000×0.024/102=235.3?mol
(4) addition of modifying agent is the 1-5% of slag quality, is the 10-50 kilogram, and calculating needs the CaO and the SiO that add in the 1000kg slag
2Quality;
(5) take respectively and need the CaO and the SiO that add in step (4)
2Quality, be crushed to respectively below 5 orders, mix then that to make modifying agent stand-by; Getting temperature with 2 tons of cinder ladles is liquid steel slag 1000kg between 1300-1500 ℃, and the modifying agent for preparing is added wherein, then adopts granulating steel slag equipment that liquid steel slag is made the granulation steel slag ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104128797A CN102534066B (en) | 2011-12-13 | 2011-12-13 | High-temperature molten steel slag treating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104128797A CN102534066B (en) | 2011-12-13 | 2011-12-13 | High-temperature molten steel slag treating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102534066A CN102534066A (en) | 2012-07-04 |
| CN102534066B true CN102534066B (en) | 2013-06-26 |
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ID=46342088
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104128797A Expired - Fee Related CN102534066B (en) | 2011-12-13 | 2011-12-13 | High-temperature molten steel slag treating method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103864326B (en) * | 2014-01-27 | 2015-12-02 | 济南大学 | A kind of slag aggregate processing method |
| CN109206054A (en) * | 2017-06-29 | 2019-01-15 | 河北卓达建材研究院有限公司 | A kind of processing method of steel slag-alkaline residue |
| CN107475468B (en) * | 2017-08-22 | 2019-03-12 | 东北大学 | A kind of method of Spinel growth behavior in regulation stainless steel slag |
| CN117607383A (en) * | 2024-01-24 | 2024-02-27 | 苏州思萃熔接技术研究所有限公司 | Method for evaluating matching property of steel slag at end of LF refining |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10121121A (en) * | 1996-10-14 | 1998-05-12 | Kawasaki Steel Corp | Method for reducing submerged expandability of steelmaking slag |
| JP2000319047A (en) * | 1999-03-10 | 2000-11-21 | Kawasaki Steel Corp | Reforming treatment of stainless steel refining slag |
| JP4000724B2 (en) * | 1999-08-27 | 2007-10-31 | Ｊｆｅスチール株式会社 | Method for reforming steelmaking slag |
| JP2002212621A (en) * | 2001-01-10 | 2002-07-31 | Nippon Steel Corp | Method for producing steelmaking slag having low expansion |
| CN1718554A (en) * | 2004-07-08 | 2006-01-11 | 武汉科技大学 | Treatment method of vanadium containing converter steel slag |
| CN100534939C (en) * | 2006-03-09 | 2009-09-02 | 宝山钢铁股份有限公司 | Steel slag treatment additive |
| CN101182138A (en) * | 2007-11-26 | 2008-05-21 | 济南大学 | Steel slag property optimized handling method |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20120704 Assignee: Handan Sanyuan Special Steel Casting Co., Ltd. Assignor: Henan University of Science and Technology Contract record no.: 2014130000143 Denomination of invention: High-temperature molten steel slag treating method Granted publication date: 20130626 License type: Exclusive License Record date: 20140729 |
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